}
            });
        }

        for (Thread th : threads) {
            th.start();
        }
        for (Thread th : threads) {
            th.join();
        }
        assertEquals(num, count.get());
        assertEquals(num, valueSet.size());

        Set<String> valueSet2 = Collections.synchronizedSet(new HashSet<>());
        threads = new Thread[threadNum];

        }
        for (int i = 0; i < crawlerContext.numOfThread; i++) {
            threads[i].start();
        }

        // join
        for (int i = 0; i < crawlerContext.numOfThread; i++) {
            try {
                threads[i].join();
            } catch (final InterruptedException e) {

    }

    @Test
    @DisplayName("Codes: all non-negative and unique")
    void codes_are_non_negative_and_unique() {
        // Edge checks: ensure there are no negative or duplicate codes
        Set<Integer> seen = new HashSet<>();
        for (int c : WinError.WINERR_CODES) {
            assertTrue(c >= 0, "Code should be non-negative: " + c);
            assertTrue(seen.add(c), "Duplicate code detected: " + c);

            bytes = bout.toByteArray();
        }

        SpnegoException restored;
        try (ByteArrayInputStream bin = new ByteArrayInputStream(bytes); ObjectInputStream oin = new ObjectInputStream(bin)) {
            restored = (SpnegoException) oin.readObject();
        }

        // Then
        assertNotNull(restored);
        assertEquals("serialize me", restored.getMessage());

        // Act: len==0 triggers initial token construction
        byte[] out = ctx.initSecContext(null, 0, 0);

        // Assert: returns a SPNEGO token (opaque here but non-null/non-empty)
        assertNotNull(out);
        assertTrue(out.length > 0);

        // Verify interactions: flags and an empty optimistic token are used
        verify(this.mechContext, times(1)).getFlags();

labels.error_title=Errore
labels.system_error_title=Errore di sistema
labels.contact_site_admin=Contatta l'amministratore del sito.
labels.request_error_title=Formato richiesta non valido.
labels.bad_request=La richiesta all'URL non è valida.
labels.page_not_found_title=Pagina non trovata.
labels.check_url=Controlla l'URL.
labels.user_name=Nome utente
labels.login=Accedi
labels.login.placeholder_username=Nome utente

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        // Test operations on empty service
        assertEquals(0, mockService.getRegistrationCount());
        assertFalse(mockService.hasRegistration("non-existent"));
        assertFalse(mockService.unregisterWitness("non-existent"));
        assertFalse(mockService.processHeartbeat("non-existent", 1));

        // Test registration with null/empty values
        String regId1 = mockService.registerWitness(null, "192.168.1.100", 1);

        assertFalse(unicodeStringFalse.zterm, "zterm should be false");
    }

    @Test
    void testConstructorWithStringAndZterm() {
        // Test with a non-empty string and zterm = true
        String testStringTrue = "Test";
        UnicodeString unicodeStringTrue = new UnicodeString(testStringTrue, true);
        assertTrue(unicodeStringTrue.zterm, "zterm should be true");

            if (input == null || input.isEmpty()) {
                assertEquals(0, result.length, "Null or empty input should produce empty array");
            } else {
                assertTrue(result.length > 0, "Non-empty input should produce non-empty array");
            }
        }
    }

    @Nested
    @DisplayName("Unicode and ASCII Encoding")
    class UnicodeAndASCIITests {

        @Test